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Remove thread-unsafe runtime requires #43

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Remove thread-unsafe runtime requires #43

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bf6391b
Replace thread-unsafe runtime requires with vanilla autoload
brasic Jun 28, 2023
48ce295
Further remove autoloading, the issue still repros on jruby and truffle
brasic Jun 28, 2023
20d9927
Add jruby runtime exclusion to abstract store
brasic Jun 28, 2023
401a002
Remove circular requires
brasic Jun 30, 2023
e8dcdb4
Ensure YAML/Psych/SQLite3 are not loaded unless they are used
brasic Jul 3, 2023
5a71a8b
Skip loading sqlite3 entirely on jruby
brasic Jul 3, 2023
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5 changes: 1 addition & 4 deletions lib/http/cookie.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -4,10 +4,7 @@
require 'uri'
require 'domain_name'
require 'http/cookie/ruby_compat'

module HTTP
autoload :CookieJar, 'http/cookie_jar'
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autoload is fine - there should be no need to change this

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I thought so too, but I tested the first commit (which left autoload in) on all truffleruby versions and older jrubies and it still exhibited thread unsafety. Here's a repro:


   require 'http/cookie'

    # We only care about the first exception, not all of them
    Thread.report_on_exception = false

    100.times.map do
      Thread.new do
        HTTP::CookieJar::HashStore.new
      end
    end.each(&:join)

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that would be related to other changes I do not see this reproducing in 9.2/9.3/9.4,
what I did on top of the PR:

diff --git lib/http/cookie.rb lib/http/cookie.rb
index 278036a..3e8f421 100644
--- lib/http/cookie.rb
+++ lib/http/cookie.rb
@@ -4,7 +4,10 @@ require 'time'
 require 'uri'
 require 'domain_name'
 require 'http/cookie/ruby_compat'
-require 'http/cookie_jar'
+#require 'http/cookie_jar'
+module HTTP
+  autoload :CookieJar, 'http/cookie_jar'
+end
 
 # This class is used to represent an HTTP Cookie.
 class HTTP::Cookie

again I am fine with the require here given there isn't a lot going on
but maybe the autoload should be kept (due compatibility) at the nested level for these:

require 'http/cookie_jar/abstract_store'
require 'http/cookie_jar/abstract_saver'

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@brasic brasic Jun 29, 2023 •
edited
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I took another look and found that I had a bug in the initial implementation. 2d5b65a (on another branch for now) is a commit on top of bf6391b that should work properly by making all six classes under HTTP::CookieJar autoloaded. I thought that addressed everything but in my testing truffleruby still has a (much rarer) issue with it. I added a task to verify safety automatically in 99dd9e4 and I get inconsistent results for truffle sometimes with the autoload approach.

~/repos/http-cookie $ rake thread_safety_check
checking for thread safety bug with 1000 threads on truffleruby 22.3.1, like ruby 3.0.3, GraalVM CE Native [x86_64-linux]
no issues detected
~/repos/http-cookie $ rake thread_safety_check
checking for thread safety bug with 1000 threads on truffleruby 22.3.1, like ruby 3.0.3, GraalVM CE Native [x86_64-linux]
no issues detected
~/repos/http-cookie $ rake thread_safety_check
checking for thread safety bug with 1000 threads on truffleruby 22.3.1, like ruby 3.0.3, GraalVM CE Native [x86_64-linux]
no issues detected
~/repos/http-cookie $ rake thread_safety_check
checking for thread safety bug with 1000 threads on truffleruby 22.3.1, like ruby 3.0.3, GraalVM CE Native [x86_64-linux]
1 of 1000 threads saw exceptions: ["NameError"]
rake aborted!
NameError: uninitialized constant HTTP::CookieJar::HashStore
/home/cbrasic/repos/http-cookie/Rakefile:34:in `const_missing'
/home/cbrasic/repos/http-cookie/Rakefile:34:in `block (3 levels) in <top (required)>'
Tasks: TOP => thread_safety_check
(See full trace by running task with --trace)

OTOH 2d5b65a does fix this for all jrubies I've tried. I've been unable to reproduce the issue with MRI anywhere even though internally we have encountered this issue with it in real workloads.

end
require 'http/cookie_jar'

# This class is used to represent an HTTP Cookie.
class HTTP::Cookie
Expand Down
23 changes: 3 additions & 20 deletions lib/http/cookie_jar.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -6,26 +6,6 @@
# any particular website.

class HTTP::CookieJar
class << self
def const_missing(name)
case name.to_s
when /\A([A-Za-z]+)Store\z/
file = 'http/cookie_jar/%s_store' % $1.downcase
when /\A([A-Za-z]+)Saver\z/
file = 'http/cookie_jar/%s_saver' % $1.downcase
end
begin
require file
rescue LoadError
raise NameError, 'can\'t resolve constant %s; failed to load %s' % [name, file]
end
if const_defined?(name)
const_get(name)
else
raise NameError, 'can\'t resolve constant %s after loading %s' % [name, file]
end
end
end

attr_reader :store

Expand Down Expand Up @@ -342,3 +322,6 @@ def cleanup(session = false)
self
end
end

require 'http/cookie_jar/abstract_store'
require 'http/cookie_jar/abstract_saver'
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these could be autoload-ed esp. if require 'http/cookie_jar' is eager

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Agreed, although after trying that I am still trying to understand why this rake task sometimes indicates thread safety issues under recent versions of truffleruby. autoloading is atomic in ruby, but only with respect to the individual constant being autoloaded. I thought I removed any mutation of other classes during autoloading but I might have missed something. Will dig further.

33 changes: 11 additions & 22 deletions lib/http/cookie_jar/abstract_saver.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -2,29 +2,15 @@

# An abstract superclass for all saver classes.
class HTTP::CookieJar::AbstractSaver
class << self
@@class_map = {}

# Gets an implementation class by the name, optionally trying to
# load "http/cookie_jar/*_saver" if not found. If loading fails,
# IndexError is raised.
def implementation(symbol)
@@class_map.fetch(symbol)
rescue IndexError
begin
require 'http/cookie_jar/%s_saver' % symbol
@@class_map.fetch(symbol)
rescue LoadError, IndexError
raise IndexError, 'cookie saver unavailable: %s' % symbol.inspect
end
end

def inherited(subclass) # :nodoc:
@@class_map[class_to_symbol(subclass)] = subclass
end

def class_to_symbol(klass) # :nodoc:
klass.name[/[^:]+?(?=Saver$|$)/].downcase.to_sym
def self.implementation(symbol)
case symbol
when :yaml
HTTP::CookieJar::YAMLSaver
when :cookiestxt
HTTP::CookieJar::CookiestxtSaver
else
raise IndexError, 'cookie saver unavailable: %s' % symbol.inspect
end
end

Expand Down Expand Up @@ -63,3 +49,6 @@ def load(io, jar)
# self
end
end

require "http/cookie_jar/yaml_saver"
require "http/cookie_jar/cookiestxt_saver"
41 changes: 22 additions & 19 deletions lib/http/cookie_jar/abstract_store.rb
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Expand Up @@ -6,29 +6,18 @@ class HTTP::CookieJar::AbstractStore
include MonitorMixin

class << self
@@class_map = {}

# Gets an implementation class by the name, optionally trying to
# load "http/cookie_jar/*_store" if not found. If loading fails,
# IndexError is raised.
# Gets an implementation class by the name.
def implementation(symbol)
@@class_map.fetch(symbol)
rescue IndexError
begin
require 'http/cookie_jar/%s_store' % symbol
@@class_map.fetch(symbol)
rescue LoadError, IndexError => e
raise IndexError, 'cookie store unavailable: %s, error: %s' % symbol.inspect, e.message
case symbol
when :hash
HTTP::CookieJar::HashStore
when :mozilla
HTTP::CookieJar::MozillaStore
else
raise IndexError, 'cookie store unavailable: %s' % symbol.inspect
end
end

def inherited(subclass) # :nodoc:
@@class_map[class_to_symbol(subclass)] = subclass
end

def class_to_symbol(klass) # :nodoc:
klass.name[/[^:]+?(?=Store$|$)/].downcase.to_sym
end
end

# Defines options and their default values.
Expand Down Expand Up @@ -122,3 +111,17 @@ def cleanup(session = false)
# self
end
end

require 'http/cookie_jar/hash_store'

begin
require 'http/cookie_jar/mozilla_store'
rescue LoadError
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if defined?(JRUBY_VERSION)
class HTTP::CookieJar::MozillaStore
def initialize(*)
raise ArgumentError, "MozillaStore is not supported on JRuby"
end
end
end
end
26 changes: 4 additions & 22 deletions test/test_http_cookie_jar.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -10,17 +10,8 @@ def test_nonexistent_store
end

def test_erroneous_store
Dir.mktmpdir { |dir|
Dir.mkdir(File.join(dir, 'http'))
Dir.mkdir(File.join(dir, 'http', 'cookie_jar'))
rb = File.join(dir, 'http', 'cookie_jar', 'erroneous_store.rb')
File.open(rb, 'w').close
$LOAD_PATH.unshift(dir)

assert_raises(NameError) {
HTTP::CookieJar::ErroneousStore
}
assert($LOADED_FEATURES.any? { |file| FileTest.identical?(file, rb) })
assert_raises(NameError) {
HTTP::CookieJar::ErroneousStore
}
end

Expand All @@ -31,17 +22,8 @@ def test_nonexistent_saver
end

def test_erroneous_saver
Dir.mktmpdir { |dir|
Dir.mkdir(File.join(dir, 'http'))
Dir.mkdir(File.join(dir, 'http', 'cookie_jar'))
rb = File.join(dir, 'http', 'cookie_jar', 'erroneous_saver.rb')
File.open(rb, 'w').close
$LOAD_PATH.unshift(dir)

assert_raises(NameError) {
HTTP::CookieJar::ErroneousSaver
}
assert($LOADED_FEATURES.any? { |file| FileTest.identical?(file, rb) })
assert_raises(NameError) {
HTTP::CookieJar::ErroneousSaver
}
end
end
Expand Down